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This paper describes the development of a MEMS tunable surface acoustic wave (SAW) device that allows an integrated sensor to be interrogated wirelessly in a range of several meters. The component itself requires no power for the wireless communication, as the principle is based on evaluating the reflected signal similar to a radar echo. The structure is similar to a one port reflective SAW delay...
This paper presents results of mechanically controlling the phase velocity of surface acoustic waves (SAW) and the application to monolithic phase shifters operating at 0.1~10 GHz. A phase sensitivity of 2deg/V and sensitivity of the phase velocity (Deltav/v) of 41times10-6 /V have been measured for devices operating at 2.45 GHz. This is 2 orders of magnitude larger than existing SAW-based monolithic...
We report on the development of a TDMA (time division multiple access) based wireless sensor system for temperature monitoring. The transponders consisting of passive surface acoustic wave delay line sensors were designed for operation in the ISM band at 2.45 GHz and for a temperature range from -20degC to 180degC. A multi-step evaluation scheme using a combined delay and phase analysis, is introduced...
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